This Body Strengthening Fruit did not enhance cultivation through the Guidance Technique but was effective in strengthening a creature's physique, which precisely addressed the problem Song Chi faced at the moment.
The power of spiritual force was inherently dependent on the creature's physique; the more powerful the spiritual force, the stronger the physique needed to be in order to sustain it. Otherwise, one could end up like the Brain-Eating Race that focused solely on cognitive development, bearing an enormous and grotesquely deformed head, while their bodies were as frail as a twig - any slight bump could cause their bodies to collapse.
Therefore, if one could strengthen their own body, they would be sufficiently able to bear the burden that came with splitting one's spirit into twenty-one parts.
